using System.Windows;
using System.Windows.Input;
using EbbesMemeClipboard.Services;
using EbbesMemeClipboard.ViewModels;
using EbbesMemeClipboard.Views;
using H.NotifyIcon;
using Microsoft.Extensions.DependencyInjection;

namespace EbbesMemeClipboard;

public partial class App : Application
{
    private static readonly ModifierKeys DefaultHotkeyModifiers = ModifierKeys.Control | ModifierKeys.Alt;
    private const Key DefaultHotkeyKey = Key.M;

    private IServiceProvider _services = null!;
    private IGlobalHotkeyService _hotkeyService = null!;
    private PickerWindow _pickerWindow = null!;
    private PickerViewModel _pickerViewModel = null!;
    private TaskbarIcon? _trayIcon;

    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);
        ShutdownMode = ShutdownMode.OnExplicitShutdown;

        var services = new ServiceCollection();
        services.AddSingleton<ILocalMemeLibraryService, LocalMemeLibraryService>();
        services.AddSingleton<IClipboardService, ClipboardService>();
        services.AddSingleton<IGlobalHotkeyService, GlobalHotkeyService>();
        services.AddSingleton<PickerViewModel>();
        services.AddSingleton<PickerWindow>();
        _services = services.BuildServiceProvider();

        _pickerViewModel = _services.GetRequiredService<PickerViewModel>();
        _pickerWindow = _services.GetRequiredService<PickerWindow>();

        _trayIcon = (TaskbarIcon)Resources["TrayIcon"];
        _trayIcon.TrayLeftMouseUp += (_, _) => _pickerWindow.ToggleVisibility();

        _hotkeyService = _services.GetRequiredService<IGlobalHotkeyService>();
        if (_hotkeyService.Register(DefaultHotkeyModifiers, DefaultHotkeyKey))
        {
            _hotkeyService.HotkeyPressed += (_, _) => Dispatcher.Invoke(() => _pickerWindow.ToggleVisibility());
        }
        else
        {
            MessageBox.Show(
                "Couldn't register the global hotkey (Ctrl+Alt+M) - it may already be in use by another application. " +
                "You can still open the picker from the tray icon.",
                "Ebbe's Meme Clipboard",
                MessageBoxButton.OK,
                MessageBoxImage.Warning);
        }
    }

    private void TrayOpenPicker_Click(object sender, RoutedEventArgs e) => _pickerWindow.ShowNearCursor();

    private async void TrayAddMemes_Click(object sender, RoutedEventArgs e)
    {
        _pickerWindow.ShowNearCursor();
        await _pickerViewModel.ImportFilesCommand.ExecuteAsync(null);
    }

    private void TrayExit_Click(object sender, RoutedEventArgs e) => Shutdown();

    protected override void OnExit(ExitEventArgs e)
    {
        _hotkeyService?.Dispose();
        _trayIcon?.Dispose();
        base.OnExit(e);
    }
}